What causes "cam walk"?

Ricks70Duster340 said
At somewhere between $250 and $300?! The idea is to have the area where the cam would push forward reinforced to prevent bending, right? Would it be possible to weld a large washer on the outside of the cover so that, when installed, the washer butts against the water pump to prevent it moving any further. Would that accomplish the same thing?
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I'm not sure. The rest of the cover is still stamped steel. How much did all that roller valve train cost? How much will it cost when the cam pushes so far forward that the lobes run into the sides of the lifters and break the camshaft into several pieces and no tellin what else? I'm not bein smart, I'm just trying to make sense.